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Do you split 2s on a 7?

The basic playing strategy for a double- or multi-deck game where doubling down after pair splitting is not allowed (NDAS) is to: split 2s against a dealer's 4, 5, 6 or 7; otherwise hit.

888casino.com - Blackjack School: How to Play a Pair of 2s - 888 Casino
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When you are playing blackjack and dealt a pair of 2s (also known as “deuces”), you have two viable playing options:

Split

Hit

Which strategy you should invoke depends upon what the dealer’s upcard is, the number of decks of cards being used, and whether double down after pair splitting is allowed.

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The basic playing strategy for a double- or multi-deck game where doubling down after pair splitting is not allowed (NDAS) is to:

split 2s against a dealer’s 4, 5, 6 or 7; otherwise hit

If the playing rules allow doubling down after pair splitting (DAS), you should also split against a dealer’s upcard of 2 and 3.

In a single-deck game, the basic playing strategy is:

If NDAS, Split against a dealer's upcard of 3, 4, 5, 6 or 7; otherwise hit

If DAS, split against dealer’s upcard of 2 through 7; otherwise hit

The following color-coded charts summarize the basic strategy for a pair of 2s.

(Note: P = Split; H = Hit.)

REASON FOR SPLITTING

Splitting 2s becomes the better option than hitting if it meets one of these criteria:

You will win more money on average

You will lose less money on average

You will turn a losing hand into a winning hand on average

Here is an example. Suppose you are playing a six-deck game with DAS and you are dealt a pair of 2s. The dealer’s upcard is a 4. If you hit, you have a negative expectation of winning. However, if you split, you expectation of winning is positive. Pair splitting is, therefore, the preferred option over hitting because it turns a negative expectation into a positive expectation (criterion #3 above). Here’s another example. Suppose you are playing a double-deck game with NDAS. You are dealt a pair of 2s and the dealer is showing a 2 upcard. Whether you split or hit, your expectation is negative; however, hitting has a lower negative expectation than splitting, meaning you will lose less money in the long run if you hit (criterion #2). The reason you split 2s against a dealer’s 2 and 3 upcard when DAS is allowed (double- and multi-deck game) is because the latter is a player-favorable rule that allows you to double your bet if you were to receive a favorable draw card on one or both of your split hands (such as a 9 plus 2 equals 11). To take full advantage of DAS, you split 2s not only against the dealer’s 4, 5, 6, or 7 but also against the dealer’s 2 and 3 upcards.

RESPLITTING 2S

If the playing rules allow you to resplit, then it is advantageous for you to do so. For example, if you are dealt a pair of 2s against a dealer’s 5 upcard, you should split them. Suppose on the first 2, you are dealt another 2 on the draw. You should resplit to form a third hand. If the casino allows resplits up to a total of four hands, then you should resplit again if you are dealt another 2. Resplitting pairs is a player- favorable option that you should always take advantage of.

BOTTOM LINE

You will always win more or lose less if you follow the above basic playing strategy for splitting or hitting a pair of 2s. For a complete basic playing strategy for any set of playing rules, consult Chapter 3 in the Ultimate Blackjack Strategy Guide.

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